Any old competent engineer can design a DAC that tests well.
I’m interested in music, so what I do is try hard to design a product to sound good. Period. Measurements notwithstanding. They just fall out, and are what they are.
For example, as one user has written elsewhere, "the majority of the distortions comes from the discrete I/U and output stage. The output amplifier and buffer has no feedback (I think). Without it the distortion values cannot compete against integrated op amps."
Virtually all mass produced entry level DACs/CD players made by the mainstream brands follow the same recipe. Op-Amps (Inexpensive off the shelve varieties) utilized for I/V conversion and analog output stage duties.
They employ generous amounts of NFB (Negative feedback) and do one thing consistently well, they yield very good test measurements and specifications. How do they reproduce music and engage the listener? Seemingly that's besides the point. They will measure quite good, mission accomplished.
Certainly it is true to say, "to each their own". I'll chose the talented designer who makes decisions .based on extensive listening and reassessment. I do not find any particular comfort with good spec numbers on paper. It has to sound very good when listening to music.
Charles